Add NUnitLite for Linux .NET Core tests

Author: xplicit

tests/ServiceStack.Text.Tests/NetCoreTestsRunner.cs

@@ -1,5 +1,5 @@
 //NUnitLite isn't recognized in VS2017 - shouldn't need NUnitLite with NUnit 3.5+ https://github.com/nunit/dotnet-test-nunit
-#if false
+#if NUNITLITE
 using NUnitLite;
 using NUnit.Common;
 using System.Reflection;

tests/ServiceStack.Text.Tests/ServiceStack.Text.Tests.csproj

@@ -54,6 +54,19 @@
     <DefineConstants>$(DefineConstants);NETCORE_SUPPORT;NETCORE</DefineConstants>
   </PropertyGroup>
 
+  <!-- Enable NunitLite build, becase NUnit is not supported on .NET Core SDK 1.0.2 
+   https://github.com/nunit/dotnet-test-nunit/issues/91 
+   To enable NUnitLite pass /p:NUNITLITE=1 into msbuild arguments
+   -->
+  <PropertyGroup Condition=" '$(NUNITLITE)' != '' ">
+    <OutputType>Exe</OutputType>
+    <DefineConstants>$(DefineConstants);NUNITLITE</DefineConstants>
+  </PropertyGroup>
+
+  <ItemGroup Condition=" '$(NUNITLITE)' != '' ">
+    <PackageReference Include="NUnitLite" Version="3.6.1" />
+  </ItemGroup>
+
   <ItemGroup Condition=" '$(TargetFramework)' == 'netcoreapp1.1' ">
     <PackageReference Include="Microsoft.NETCore.Portable.Compatibility" Version="1.0.1" />
     <PackageReference Include="Microsoft.Extensions.Primitives" Version="1.*" />